I do use alt text but really I think this should be a client-side function. Also i've noticed that a lot of alt text captions are dreadful, absurdly over-writte

I do use alt text but really I think this should be a client-side function. Also i've noticed that a lot of alt text captions are dreadful, absurdly over-written blocks of text that make me wonder if the person is a frustrated novelist. With client-side approach, people could choose whether they want terse or verbose image descriptions as needed.